/*
 * MIT License
 *
 * Copyright (c) 2023 北京凯特伟业科技有限公司
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package com.je.bpm.engine.impl.variable;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class JsonType implements VariableType {

    private static final Logger logger = LoggerFactory.getLogger(JsonType.class);
    public static final String JSON = "json";

    private final int maxLength;
    private ObjectMapper objectMapper;
    private boolean serializePOJOsInVariablesToJson;
    private JsonTypeConverter jsonTypeConverter;

    public JsonType(int maxLength, ObjectMapper objectMapper, boolean serializePOJOsInVariablesToJson,
                    JsonTypeConverter jsonTypeConverter) {
        this.maxLength = maxLength;
        this.objectMapper = objectMapper;
        this.serializePOJOsInVariablesToJson = serializePOJOsInVariablesToJson;
        this.jsonTypeConverter = jsonTypeConverter;
    }

    @Override
    public String getTypeName() {
        return JSON;
    }

    @Override
    public boolean isCachable() {
        return true;
    }

    @Override
    public Object getValue(ValueFields valueFields) {
        Object loadedValue = null;
        if (valueFields.getTextValue() != null && valueFields.getTextValue().length() > 0) {
            try {
                loadedValue = jsonTypeConverter.convertToValue(
                        objectMapper.readTree(valueFields.getTextValue()), valueFields);

            } catch (Exception e) {
                logger.error("Error reading json variable " + valueFields.getName(), e);
            }
        }
        return loadedValue;
    }

    @Override
    public void setValue(Object value, ValueFields valueFields) {
        try {
            valueFields.setTextValue(objectMapper.writeValueAsString(value));
            if (value != null) {
                valueFields.setTextValue2(value.getClass().getName());
            }
        } catch (JsonProcessingException e) {
            logger.error("Error writing json variable " + valueFields.getName(), e);
        }
    }

    @Override
    public boolean isAbleToStore(Object value) {
        if (value == null) {
            return true;
        }

        if (JsonNode.class.isAssignableFrom(value.getClass()) || (objectMapper.canSerialize(value.getClass()) && serializePOJOsInVariablesToJson)) {
            try {
                return objectMapper.writeValueAsString(value).length() <= maxLength;
            } catch (JsonProcessingException e) {
                logger.error("Error writing json variable of type " + value.getClass(), e);
            }
        }

        return false;
    }

}
